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    <div class="post-body" itemprop="articleBody"><h2 id="缘起"><a href="#缘起" class="headerlink" title="缘起"></a>缘起</h2><p>无非就是“又”失业了，重新开始找工作，原本还不想招惹外包公司，无奈行情不好，外包工作也是工作呀，于是乎，就定了某个外包公司的面试，第一面：外包公司的技术面。</p>
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<h2 id="心得体会"><a href="#心得体会" class="headerlink" title="心得体会"></a>心得体会</h2><p>主要问题都是跟 aws 有关系，这个岗位的甲方是个外企，肯定重度使用 aws。而且还在用 aws 的 eks 服务。</p>
<p>感觉面试官的视野还是很重要的。</p>
<h2 id="几个具体问题"><a href="#几个具体问题" class="headerlink" title="几个具体问题"></a>几个具体问题</h2><p>有个细节：腾讯会议面试，面试官几个人，可能是三个，首先特意让我把视频打开，于是我打开了，但是对方并没有打开。好吧，我是求职者，不对等也正常。</p>
<p>但为什么面试需要让面试者打开视频呢？这个不太明白，也许相关 HR 会比较清楚这一点。</p>
<h3 id="关于-eks-的-ingress"><a href="#关于-eks-的-ingress" class="headerlink" title="关于 eks 的 ingress"></a>关于 eks 的 ingress</h3><p>问我 eks 里的服务通过 ingress 暴露出去，然后数据包是怎么从外网到 pod 的。</p>
<p>这个题我答的不好，前东家其实差不多就是这个架构：nginx-ingress，然后外面是 aws 的 LB，我一直在解释外网流量到 aws 的 LB 设备之后然后是转到 eks 集群的 node 节点的某个 tcp 端口，我的意思是，其实服务最终是通过 nodeport 透出去的。</p>
<p>上面我说的这个大概是基本上没太大问题的，但是人家问的应该不是这个。:(</p>
<p>其实上面我提到的 nodeport 透出去的服务正是 nginx-ingress（或者是 nginx-ingress-controller，具体忘了，我得再看看 nginx-ingress）</p>
<h3 id="关于被-nginx-反代的服务如何获得客户端的真实-IP-的问题"><a href="#关于被-nginx-反代的服务如何获得客户端的真实-IP-的问题" class="headerlink" title="关于被 nginx 反代的服务如何获得客户端的真实 IP 的问题"></a>关于被 nginx 反代的服务如何获得客户端的真实 IP 的问题</h3><p>这个其实我比较熟悉，http 基本协议嘛。</p>
<p>我说这个简单，在反代的 nginx 配置里将 client ip 直接写入一个特定的 http 头，然后真实的服务里再把这个头取出来即可。</p>
<p>其实这个回答完全没毛病，我之前有项目就是这么干的。但面试官却感觉好像抓住了什么一样拼命问我到底是哪个 http 头？搞得我都有点上头了，我于是说：“哪个头不一样吗，只要跟后端协商好了就行了”。还被追问，还问一般标准是哪个头，于是我只能说 X-Forwarded-For，于是面试官认可了。</p>
<p>我其实没有细说为什么要另外弄一个头，这是因为客户端访问服务，中间可能会过 n 层代理，理论上每一层都会且必须要往 X-Forwarded-For 里写东西，但实际上，守规矩的人有，但绝对不是全部！于是我们的逻辑就是单独再搞一个 http 头，算是有点私有协议的意思，自己用，这样感觉比直接用 X-Forwarded-For 更靠谱一些。</p>
<h3 id="Jenkins-怎么做代码触发自动构建（CI）"><a href="#Jenkins-怎么做代码触发自动构建（CI）" class="headerlink" title="Jenkins 怎么做代码触发自动构建（CI）"></a>Jenkins 怎么做代码触发自动构建（CI）</h3><p>某个面试官问的，我当时回答：我不知道。我真不知道，或者我们曾经也有用过这种功能，但因为具体不是我配的，我就没了解到。但我知道，这个是绝度可以实现的，大致猜想是通过 webhook 之类的东西来做就可以。</p>
<p>我又说，我们有时并没有用 Jenkins，面试官就逼问：“没有 Jenkins 怎么做 CI&#x2F;CD 呢？”，我当时就笑了，说：“我的好几个前司，项目的 CI&#x2F;CD 是直接在 gitlab 里做的。”（他可能不太清楚 gitlab 本身就有 CI&#x2F;CD 的功能）。而我恰恰由于要维护这个，曾经大概看过相关配置。</p>
<p>估计他也不知道 github-action 之类的东西吧。</p>
<h3 id="关于-serverless"><a href="#关于-serverless" class="headerlink" title="关于 serverless"></a>关于 serverless</h3><p>我回答说之前的某司，我用过 aws 上的什么服务来着（我真是这么说的，我忘了那个叫 Lambda 了），用那个写了个 python 程序，定时执行一些操作。那个我理解就是 serverless</p>
<h3 id="用过多少-aws-的服务"><a href="#用过多少-aws-的服务" class="headerlink" title="用过多少 aws 的服务"></a>用过多少 aws 的服务</h3><p>于是我就说了一堆，但的确好多服务我忘了名字了，我只能简单介绍下这个服务是干啥的。我估计我用的好多服务面试官们也没用过，：）。这个很正常，就像他们用过的服务有些我也没用过一样。</p>
<h3 id="eks-中的服务暴露出来的几种方法"><a href="#eks-中的服务暴露出来的几种方法" class="headerlink" title="eks 中的服务暴露出来的几种方法"></a>eks 中的服务暴露出来的几种方法</h3><p>我居然只回答出 nodeport 和 ingress 两种，连 LB 设备这个都忘了。:(</p>
<h2 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h2><p>最终的结果，自然是挂了呀。:(</p>

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